Potassium Sulfite Formula

Potassium Sulfite Chemical Formula

Potassium Sulfite is a non-flammable white soluble compound. It is commonly used as a food preservative (E225). Let us learn about the chemical formula and various other details of Potassium Sulfite.

Chemical formula K2O3S
Molecular weight 158.254 g/mol
Chemical names Dipotassium sulfite

Potassium sulphite

Sulfurous acid, dipotassium salt

Solubility in water Soluble
Acidity (pKa) 8

Potassium Sulfite Structural Formula

The structural formula of Potassium Sulfite is as shown in the figure below. The potassium sulfite is formed by decomposition of potassium metabisulfite at 190°C.

K2S2O5 → K2SO3 + SO2

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